A 2012 Sonic with XM and the OnStar tri-band antenna may not have any radio reception (AM, FM or XM) and OnStar service may fade in and out while driving.
Inspect the antenna coaxial connections at the tri-band antenna for proper routing. (Fig. 14) The coaxial connections may be swapped at the body side of the harness at the antenna connector.
– Thanks to Ernest Haller